If P(x, y) is the preimage of a point, then its image after a dilation centered at the origin (0,0) with scale factor k is the point P′( , ).

Step-by-step explanation:

based on what i know is that P(1x,1y) is the the slope of the dilation so P' could equal (2,2) (3,3) (4,4) and so on. k = (1,1)

b. 24 mm

step-by-step explanation:

use the pythagorean theorem.

a^2 + b^2 = c^2

a^2 + 7^2 = 25^2

a^2 + 49 = 625

a^2 = 576

a = 24

answer: b. 24 mm